Title :
Liquid crystal phase modulator for large screen projection
Author :
Fritsch, M. ; Wöhler, H. ; Haas, G. ; Mlynski, D.A.
Author_Institution :
Theor. Elektrotech. und Messtech., Karlsruhe Univ., West Germany
Abstract :
A liquid-crystal (LC) phase modulator was investigated as a possible substitute for the electrically deformable oil film used for image generation in some large-screen projectors. The LC causes a voltage-dependent phase shift of the incident light, which is converted into amplitude-modulated light by means of a schlieren optical system. To achieve great optical efficiency, the LC cell is designed to work without polarizers. When used with thin-film-transistor arrays as drivers, a grey-scale projection is possible.<>
Keywords :
amplitude modulation; liquid crystal displays; optical modulation; phase modulation; schlieren systems; amplitude-modulated light; drivers; electrically deformable oil film; grey-scale projection; image generation; large screen projection; liquid crystal phase modulator; optical efficiency; schlieren optical system; thin-film-transistor arrays; voltage-dependent phase shift; Image converters; Image generation; Liquid crystals; Optical design; Optical films; Optical modulation; Optical polarization; Petroleum; Phase modulation; Voltage;
Conference_Titel :
Display Research Conference, 1988., Conference Record of the 1988 International
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/DISPL.1988.11311
